.portal-com-copyright {
    position: absolute;
    top: 50%;
    width: 100%;
    height: 30px;
    margin-top: -15px;
    color: #fff;
    text-align: center;
    line-height: 30px;
}

.portal-icon-copyright {
    font-size:24px;
    color:#000;
    visibility: hidden;
}

.portal-com-copyright:hover .portal-icon-copyright {
    visibility: visible;
}